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Chd|====================================================================
Chd|  SPMD_FXB_FOR                  source/mpi/kinematic_conditions/spmd_fxb_for.F
Chd|-- called by -----------
Chd|        FXBYFOR                       source/constraints/fxbody/fxbyfor.F
Chd|-- calls ---------------
Chd|====================================================================
      SUBROUTINE SPMD_FXB_FOR(FXBIPM, MFEXTP)
C-----------------------------------------------
C   I m p l i c i t   T y p e s
C-----------------------------------------------
#include      "implicit_f.inc"
C-----------------------------------------------------------------
C   M e s s a g e   P a s s i n g
C-----------------------------------------------
#ifdef MPI
#include "mpif.h"
#endif
C-----------------------------------------------
C   C o m m o n   B l o c k s
C-----------------------------------------------
#include      "com01_c.inc"
#include      "com04_c.inc"
#include      "task_c.inc"
#include      "fxbcom.inc"
C-----------------------------------------------
C   D u m m y   A r g u m e n t s
C-----------------------------------------------
      INTEGER FXBIPM(NBIPM,*)
      my_real
     .        MFEXTP(*)
C-----------------------------------------------
C   L o c a l   V a r i a b l e s
C-----------------------------------------------
#ifdef MPI
      INTEGER NFX, NMOD, NME, LEN, AVAR, PMAIN, II, I, ITAG, MSGOFF,
     .        REQ(NSPMD-1), STAT(MPI_STATUS_SIZE,NSPMD-1), IERR,
     .        J
      my_real
     .       , DIMENSION(:,:), ALLOCATABLE :: FF
C
      DATA MSGOFF /196/
C
      DO NFX=1,NFXBODY
         NMOD=FXBIPM(4,NFX)
         NME=FXBIPM(17,NFX)
         LEN=NME+NMOD
         AVAR=FXBIPM(13,NFX)
         PMAIN=FXBIPM(39,NFX)
         IF (ISPMD==PMAIN) THEN
            ALLOCATE(FF(LEN,NSPMD-1))
            II=0
            DO I=1,NSPMD
               IF (ISPMD==I-1) CYCLE
               II=II+1
               ITAG=MSGOFF
               CALL MPI_IRECV(FF(1,II), LEN, REAL, IT_SPMD(I), ITAG,
     .                        MPI_COMM_WORLD, REQ(II), IERR)
            ENDDO
C
            CALL MPI_WAITALL(NSPMD-1, REQ, STAT, IERR)
            DO I=1,NSPMD-1
               DO J=1,LEN
                  MFEXTP(AVAR+J-1)=MFEXTP(AVAR+J-1)+FF(J,I)
               ENDDO
            ENDDO
            DEALLOCATE(FF)
         ELSE
            ITAG=MSGOFF
            CALL MPI_ISEND(MFEXTP(AVAR), LEN, REAL, IT_SPMD(PMAIN+1),
     .                     ITAG, MPI_COMM_WORLD, REQ(1), IERR)
C
            CALL MPI_WAIT(REQ, STAT, IERR)
         ENDIF
      ENDDO
C
#endif
      RETURN
      END
